amis-30523 ON Semiconductor, amis-30523 Datasheet - Page 26
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amis-30523
Manufacturer Part Number
amis-30523
Description
Amis-30523 Product Preview Can Micro-stepping Motor Driver
Manufacturer
ON Semiconductor
Datasheet
1.AMIS-30523.pdf
(35 pages)
- Current page: 26 of 35
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Watchdog Function
<WDEN> bit (See Table 15 SPI Control Registers address
00h). Once this bit has been set to “1” (watchdog enable), the
microcontroller needs to re−write this bit to clear an internal
timer before the watchdog timeout interval expires. In case
NOTE:
programmable through the WDT[3:0] bits (See Table 14
SPI Control Registers address 00h). The timing is given in
Table 13 below.
The watchdog function is enabled/disabled through
The duration of the watchdog timeout interval is
t
DSPI
is the time needed by the external microcontroller to shift−in the <WDEN> bit after a power−up.
t
V
WDTO
DDH
VDD
VBB
t
POR/WD pin
Enable WD
Acknowledge WD
WD timer
> t
t
PU
t
WDPR
Figure 23. Watchdog Timing Diagram
POR
t
DSPI
and < t
http://onsemi.com
WDTO
26
the timer is activated and WDEN is acknowledged too early
(before t
a reset of the microcontroller will occur through PORB/WD
pin. In addition, a warm/cold boot bit <WD> is available in
Table 17 for further processing when the external
microcontroller is alive again. See Figure 23.
t
WDRD
WDPR
) or not within the interval (after t
= t
WDPR
t
POR
or = t
WDTO
t
t
t
WDTO
), then
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